#!/usr/bin/env node

/* By starting at the top of the triangle below and moving to adjacent
   numbers on the row below, the maximum total from top to bottom is
   23. (3 -> 7 -> 4 -> 9)
   3
   7 4
   2 4 6
   8 5 9 3

   Find the maximum total from top to bottom of the triangle below:
   75
   95 64
   17 47 82
   18 35 87 10
   20 04 82 47 65
   19 01 23 75 03 34
   88 02 77 73 07 63 67
   99 65 04 28 06 16 70 92
   41 41 26 56 83 40 80 70 33
   41 48 72 33 47 32 37 16 94 29
   53 71 44 65 25 43 91 52 97 51 14
   70 11 33 28 77 73 17 78 39 68 17 57
   91 71 52 38 17 14 91 43 58 50 27 29 48
   63 66 04 68 89 53 67 30 73 16 69 87 40 31
   04 62 98 27 23 09 70 98 73 93 38 53 60 04 23 */

var fns = require('../functions.js'),
    timer = require('../timer.js');

exports.main = function(verbose) {
  if (typeof verbose == 'undefined') {
    verbose = false;
  }
  function nonEmptyFilter(str) {
    return (str != '');
  };

  function toNumListMap(str) {
    return str.split(' ').map(Number);
  };
  var triangle = fns.getData(18).split('\n'),
      triangleMat = triangle.filter(nonEmptyFilter).map(toNumListMap);

  return fns.maxSum(triangleMat);
};

if (require.main === module) {
  timer.timer(18, exports.main);
}
